Reset previousRowsLength before a new row-group is handled

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@605195 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/layoutmgr/table/TableStepper.java

@@ -75,6 +75,7 @@ public class TableStepper {
     private void setup(int columnCount) {
         this.columnCount = columnCount;
         this.activeRowIndex = 0;
+        this.previousRowsLength = 0;
     }
 
     /**